Inconel alloy MA754.pdf - Special Metals Corporation

www.specialmetals.comINCONEL alloy MA754 (UNS N07754) is an oxidedispersion strengthened, nickel-chromium superalloy,produced by mechanical alloying. Its yttrium oxidedispersoid imparts exceptional high-temperaturestrength and creep resistance to the highly corrosionresistantnickel-chromium matrix.The alloy’s strength, in conjunction with its highmelting point and microstructural stability, makes it anattractive material for gas turbine engine components,furnace fixtures and skid rails, fasteners and otherapplications where high temperature creep andcorrosion resistance are required.Physical PropertiesTable 2 - Physical PropertiesMelting point a (Approximate Solidus) ..............2550°F (1400°C)Density b ................................................0.309 lb/in 3 (8.55 g/cm 3 )Permeability c ......................................................................1.001a High strength, especially at elevated temperatures, is an outstandingcharacteristic of INCONEL alloy MA754. The oxide dispersionstrengthening (ODS) achieved through mechanical alloying remainseffective at temperatures close to the alloy’s melting point.b The alloy’s density is in the range typical of nickel-based superalloys.c Measured at 200 oersteds (15.9 kA/m) and 70°F (21°C).Table 1 - Nominal Chemical Composition, %Nickel......................................................................................78Chromium ...............................................................................20Iron.........................................................................................1.0Carbon.................................................................................0.05Aluminum...............................................................................0.3Titanium .................................................................................0.5Yttrium Oxide.........................................................................0.6Table 3 - Young’s Modulus of Elasticity (Longitudinal)TemperatureTextured BarUntextured Bar°F °C 10 3 ksi GPa 10 3 ksi GPa70 21 21.6 149 29.4 203200 93 21.3 147 29 200400 204 20.6 142 28.1 194600 316 19.8 137 27.1 187800 427 18.8 130 26 1791000 538 18 124 24.9 1721200 649 17 117 23.6 1631400 760 15.9 110 22.3 1541600 871 14.8 102 20.8 1431800 982 13.6 94 19.3 1332000 1093 12.4 85 17.8 123The modulus of elasticity (Young’s modulus) of INCONEL alloy MA754 varies with the degree of crystallographictexture imparted during hot working. For applications requiring resistance to thermal fatigue, the alloy is processedto develop a low modulus of elasticity in the longitudinal direction. Young's modulus of INCONEL alloy MA754varies with temperature according to the equation:E/E RT = 0.9988 - (1.306 x 10 -4 dT) - (4.298 x 10 -8 dT 2 )where:EE RTdT= Young’s modulus (psi) at temperature of interest,= Young’s modulus at room temperature, and= Temperature of interest minus room temperature (°F).INCONEL ® alloy MA754Publication Number SMC-040Copyright © Special Metals Corporation, 2004 (Sept 04)INCOLOY and INCONEL are trademarks of theSpecial Metals Corporation group of companies.The data contained in this publication is for informational purposesonly and may be revised at any time without prior notice. The data isbelieved to be accurate and reliable, but Special Metals makes norepresentation or warranty of any kind (express or implied) andassumes no liability with respect to the accuracy or completeness ofthe information contained herein. Although the data is believed to berepresentative of the product, the actual characteristics or performanceof the product may vary from what is shown in this publication.Nothing contained in this publication should be construed asguaranteeing the product for a particular use or application.

INCONEL ® alloy MA754Thermal & Electrical PropertiesThermal Expansion (CTE)The thermal expansion characteristics of INCONEL alloyMA754 closely match those of other chromium-containingnickel alloys.Thermal ConductivityElectrical ResistivityINCONEL alloy MA754 has resistivity characteristicssimilar to those of 80-20 Ni-Cr resistance heating alloys. Itsoxide dispersion strengthening helps resist creep andsagging at high temperatures.This property increases with temperature and is higher thanfor ceramics.Table 4 - Thermal and Electrical Properties of INCONEL alloy MA754Temperature,°CExpansion coefficient(longitudinal),10 -6 •°CExpansion coefficient(transverse),10 -6 •°CThermal conductivity,W/m•°CElectrical resistivity,µΩ•mSpecific heat,J/kg•°C26 - - 14.3 1.08 440100 12.2 12.5 15.8 1.09 461200 13.1 13.4 17.7 1.10 488300 13.7 14.0 19.5 1.11 515400 14.2 14.3 21.4 1.12 540500 14.6 14.8 23.2 1.14 567600 15.1 15.2 25.0 1.15 595700 15.7 15.8 27.0 1.14 620800 16.1 16.2 28.9 1.14 647900 16.6 16.6 30.8 1.15 6721000 17.0 17.1 32.6 1.16 6951100 - - 34.2 1.18 7201200 - - 35.8 1.19 -2

INCONEL ®alloy MA754Mechanical PropertiesPlate & SheetINCONEL alloy MA754 develops optimum high-temperature strength through controlled thermo-mechanical processingdesigned to create a stable, recrystallized, coarse grain structure. Plate products are processed to achieve isotropic properties.Textured BarINCONEL alloy MA754 can be processed to have a highly textured crystallographic structure, producing excellent resistanceto thermal fatigue. In such a condition, the properties are anisotropic. Elastic properties are also affected by thecrystallographic texture.In this condition, the ODS mechanism is augmented, for superior mechanical properties in the longitudinal direction, bythe high aspect ratio grain structure. The highly directional structure is responsible for anisotropic mechanical properties. Forapplications that require exceptional resistance to thermal fatigue, like gas turbine vanes, INCONEL alloy MA754 is given astrong texture with a crystallographic direction parallel to the working direction. Such texture results in a low modulusof elasticity in the longitudinal direction, improving resistance to thermal fatigue by lowering stresses for given thermalstrains.2004020Stress, ksi175150125100755025UTS0.2% YS% Elong3530252015Elongation, %Stress, ksi151052000F-Long2000F-L-T2100F-Long2100F-L-T00200400600800 1000 1200 1400 1600Temperature, °F1800 20001022000100 1000Hours to rupture10000Figure 1. Tensile properties of textured bar - longitudinal.Figure 3. Stress rupture strength of INCONEL alloy MA754textured bar.200175150UTS0.2% YS% Elong4030Stress, ksi1251007520Elongation, %50102500200400600800 1000 1200 1400 1600Temperature, °F1800 200002200Figure 2. Tensile properties of textured bar - long transverse (L-T).3

INCONEL ® alloy MA754Corrosion ResistanceOxidation ResistanceINCONEL alloy MA754 has excellent oxidation resistance.It may be used in high-temperature oxidizing environmentswithout the need for expensive special coatings usuallyrequired for conventional high-temperature alloys.Nitridation ResistanceThe nature of the alloy’s protective scale, and its high nickelcontent, provide excellent resistance to nitridation.Mass Change, mg/cm 2500-50-100-150-200MA754601617-250-300-3500 200 400 600 800600800H1000 1200Exposure Time - hoursFigure 4. Mass change of several wrought high temperature alloysin air + 5% water vapor at 2150°F (1177°C).330Mass Change, mg/cm 2121086420617800H601600330MA7540 200 400 600 800 1000 1200 1400Time, hoursFigure 5. Mass change of several high temperature alloys in N 2 -5%H 2 at 2150°F (1177°C).Table 5 - Penetration results for eight alloys exposed in air + 5% water vapor for 1008 hours at 2150°C (1177°F)AlloyMetal Loss,milsMaximum Attack, mils330 Stainless Steel 10.0 14.6600 12.4 13.6617 0.8 5.6800H 18.0 20.4INCONEL alloy MA754 0.1 3.8601 1.7 >23.84

INCONEL ®alloy MA754Burner-Rig PropertiesUncoated INCONEL alloy MA754 has been used extensively in jet fuel combustion environments. Tests at 1700°F (927°C)for 168 h in JP-5 fuel with 0.3% sulfur and 5 ppm sea water. Air-to-fuel ratio: 30 to 1. Thermal cycle: 58 min at 1700°F(927°C), rapid cool to room temperature in 2 min.Table 6 - Burner-Rig PropertiesMaterialWeight Change, Mg/cm 2 Metal Loss Max. AttackUndescaled DescaledmilµmmilµmINCONEL alloy MA754 -0.1 -7.4 0.79 20 3.11 79Alloy IN-738 +1.4 -6.1 1.06 27 5.83 148MAR-M a 509 +0.9 -12.4 1.10 28 5.98 152Alloy X-40 -0.8 -9.6 1.18 30 5.71 145Alloy 713C b -386.0 -431.0 130 3304 130 3304a Trademark of Martin Marietta Corp.b Completely destroyed.Creep & Fatigue PropertiesINCONEL alloy MA754 is one of the most creep-resistantcommercially available alloys for service at over 2000°F(1095°C). This characteristic offers superior resistance tobowing and sagging under load at high temperatures. Thealloy has good thermal fatigue resistance compared to manyhigh strength superalloys. Thermal strains are reduced in thelow modulus direction of textured bar.Stress, ksi53210.5INCONEL alloy MA754INCOLOY alloy 330INCONEL alloy 601INCONEL alloy 617INCOLOY alloy 800HINCONEL alloy 6000.10.00001 0.00010 0.00100 0.01000 0.10000 1.00000Creep Rate, %/hFigure 6. Minimum creep rate results for several wrought hightemperature alloys at 2150°F (1177°C).5

INCONEL ® alloy MA754WorkingMachiningThe alloy is readily machined by all conventional techniques. Its annealed hardness is Rc 29. If electric discharge machining(EDM) or laser cutting is to be used, it is recommended that the recast layer be removed by grinding.Information on machining is available in the Special Metals publication “Machining” on the website,www.specialmetals.com.JoiningThe strongest joints are produced by processes such as laser and electron beam welding and diffusion bonding. Brazing hasbeen used for years with great success in applications such as gas turbine engines. Mechanical joints such as rivets, pins,threaded connections and fir tree joints are also often used. Conventional TIG welding can be used but leads to reduced hightemperaturestress rupture strength at the joint.Information on joining is available in the Special Metals publication “Joining” on the website, www.specialmetals.com.FormingIn the final annealed condition, INCONEL alloy MA754 has a coarse, creep resistant grain structure, and thus exhibits limitedhot formability. The alloy can be hot worked into the desired shape prior to the grain coarsening final anneal. INCONEL alloyMA754 is easily cold worked, but such deformation may cause the alloy to recrystallize to a fine grain condition uponexposure to high temperature. A fine grain structure will have reduced high temperature strength properties. Special MetalsCorporation should be contacted to work with the fabricator to develop such processes.Product FormsINCONEL alloy MA754 is designated as UNS N07754.Alloy MA754 is available as tube, sheet, plate, round barand flat bar.Table 7 - Available Forms and Size Ranges of INCONEL alloy MA 754inchesmmHot-rolled sheet 0.05-0.1 1-3Hot-rolled plate 0.2-1.5 5-38Hot-finished round bar 0.75-2 19-51Flat bar from: 3/4 x 4 19 x 102to: 3 1/2 x 5 1/2 89 x 140Tubeextruded tubing can be produced over arange of diameters and wall thicknesses.6

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